Anaerobic co-digestion of corn stover and chicken manure using continuous stirred tank reactor: The effect of biochar addition and urea pretreatment

Yu, Qin; Sun, Chen; Liu, Ronghou; Yellezuome, Dominic; Zhu, Xianpu; Bai, R. Kasturi; Liu, Mingquan; Sun, Mengzeng

doi:10.1016/j.biortech.2020.124197

Cited by 73 publications

(22 citation statements)

References 43 publications

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“…Hence, methanogens—particularly acetoclastic methanogenesis—was inhibited by the low pH [ 33 ]. In this study, the shorter acidification recovery time for all pretreated groups suggests that urea addition could improve buffer capacity to some extent, which is beneficial for AD [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

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Biomethane Yield, Physicochemical Structures, and Microbial Community Characteristics of Corn Stover Pretreated by Urea Combined with Mild Temperature Hydrotherm

et al. 2021

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The corn stover (CS)’s compact structure makes it challenging for microorganisms to use in anaerobic digestion (AD). Therefore, improving CS biodegradability has become a key focus in AD studies. Methods are being targeted at the pretreatment of CS, combining advanced urea with mild temperature hydrotherm pretreatment to study its effect on promoting the AD process of CS. The biomethane yield, physicochemical structure, and microbial community characteristics were investigated. CS samples were assigned into groups differed by a range of pretreatment times (from 24 to 96 h) and set at a temperature of 50 °C with a 2% urea addition. Results revealed that the 72-h group obtained the highest biomethane yield of 205 mL/g VS−1, volatile solid (VS) and total solid (TS) removal rates of 69.3% and 47.7%, which were 36.7%, 25.3% and 27.5% higher than those of untreated one, respectively. After conducting several analyses, results confirmed the pretreatment as a method for altering CS microstructures benefits biomethane production. The most resounding differences between pretreated and untreated groups were observed within a microbial community, an integral factor for improved AD performance. This study serves to confirm that this specific pretreatment is an effective method for enhancing biomethane production in CS.

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Section: Resultsmentioning

confidence: 99%

“…This combined approach seemingly achieved better results than that of single base-treated CS set to the same pretreatment conditions [ 18 ]. Yu et al [ 19 ] reported that urea pretreatment combined with biochar could improve the digestibility of lignocellulosic substrates, while also enhancing the buffer capacity of the AD process.…”

Section: Introductionmentioning

confidence: 99%

Biomethane Yield, Physicochemical Structures, and Microbial Community Characteristics of Corn Stover Pretreated by Urea Combined with Mild Temperature Hydrotherm

et al. 2021

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“…Variation in the physicochemical properties of AM has revealed that the composition of manure is highly dependent on animal feed [42]. AM typically has a low C/N ratio (9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19), high buffering capacity, and high biodegradability [43,44]. It contains a VS/TS ratio ranging between 0.65 and 0.90 [40,43].…”

Section: Types Of Organic Wastementioning

confidence: 99%

Volatile Fatty Acid Production from Organic Waste with the Emphasis on Membrane-Based Recovery

2021

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In recent years, interest in the biorefinery concept has emerged in the utilization of volatile fatty acids (VFAs) produced by acidogenic fermentation as precursors for various biotechnological processes. This has attracted substantial attention to VFA production from low-cost substrates such as organic waste and membrane based VFA recovery techniques to achieve cost-effective and environmentally friendly processes. However, there are few reviews which emphasize the acidogenic fermentation of organic waste into VFAs, and VFA recovery. Therefore, this article comprehensively summarizes VFA production, the factors affecting VFA production, and VFA recovery strategies using membrane-based techniques. Additionally, the outlook for future research on VFA production is discussed.

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“…Continuously stirred tank reactors (CSTRs) are widely applied for the AD treatment of high-solid wastes such as crop straws [5]. In this system, biogas is produced conventionally with continuous feeds in laboratory-scale experiments or industrial projects [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Feeding Regimes on Process Performance and Microbial Community Structure in Anaerobic Semi-continuously Stirred Tank Reactors Treating Corn Stover

Yuan

et al. 2021

Waste Biomass Valor

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Corn stover is one of the dominant agricultural wastes in China, with high lignocellulose contents. Anaerobic digestion of corn stover converts biomass to biogas as sustainable energy. To improve the performance of anaerobic digestion, as well as for flexible biogas production, the effects of different feeding regimes on biogas production, system stability, and microbial community structure were investigated using laboratory-scale semi-continuously stirred tank reactors (semi-CSTRs) fed pretreated corn stover once a day (R1), every 2 days (R2) and every 3 days (R3) at an equivalent amount. The results showed that R3 and R2 produced 11.1% and 8.4% more methane, respectively. R3 correspondingly had higher lignocellulose conversion rates and system stability, followed by R2 and R1. Greater fluctuations in biogas, VFA concentrations and pH were found in less frequently fed reactors during the time interval between two feeds. Additionally, less feeding increased the relative abundance of Bacteroidetes and Firmicutes during hydrolysis and acidogenesis, and the dominant genus of archaea in all reactors was Methanobacterium, which is a hydrogenotrophic methanogen. Therefore, appropriately reducing the feeding frequency can increase the process performance of anaerobic digestion of corn stover.

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Anaerobic co-digestion of corn stover and chicken manure using continuous stirred tank reactor: The effect of biochar addition and urea pretreatment

Cited by 73 publications

References 43 publications

Biomethane Yield, Physicochemical Structures, and Microbial Community Characteristics of Corn Stover Pretreated by Urea Combined with Mild Temperature Hydrotherm

Biomethane Yield, Physicochemical Structures, and Microbial Community Characteristics of Corn Stover Pretreated by Urea Combined with Mild Temperature Hydrotherm

Volatile Fatty Acid Production from Organic Waste with the Emphasis on Membrane-Based Recovery

Effects of Feeding Regimes on Process Performance and Microbial Community Structure in Anaerobic Semi-continuously Stirred Tank Reactors Treating Corn Stover

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